Notices of Memoirs — Belinuriis — Devo}iian. 177 



a small I'egion of the fault-surface and would occur at a slight depth, 

 the intensity of the shock would rapidly fade away from the 

 epicentre ; the disturbed area would therefore be small and circular 

 in form ; and the shock and sound would be of brief duration, and in 

 many ways resembling those produced by the fall of a heavy mass 

 of rock. 



If this is a cori'ect explanation of some of the earth-shakes which 

 occur in mining districts, it follows that such cannot be classed 

 either with true or with spurious earthquakes. They are of natural 

 origin in so far as they are produced by fault-slips, but artificial in 

 tiiat the slips are brought about by human labour and not by the 

 slow and gradual cooling of the earth. 



Note on Belinurus grand.i^vus.^ 



IN a review of a paper by Professor T. E. Jones & Dr. Henry 

 Woodward on Belinurus grandcevus, a new species of PalEeozoic - 

 Limuloid Crustacean from the ' Eo-Carboniferous ' of Eiversdale, 

 N.S., it is stated on p. 208 of this joiirnal that Belinurus has 

 not been found in rocks of earlier age than the Coal-measures. 

 In Geikie's Text Book of Geology, however, this genus is mentioned 

 as occurring with Ftenjgotus, Bothriolepis, Coccosteus, Pterichthys, 

 Glyptolepis, and other typical Lower Devonian and Silurian forms 

 in the Kiltorcan Beds of Ireland. Thus the inference drawn in the 

 conclusion of this article that these rocks are Carboniferous does not 

 seem to be sustained. May it not, on the other hand, be assumed 

 that "The faunas of the seas of the Lower Carboniferous, Coal 

 formation, and Permian periods, both in Europe and America, 

 present so great similarities that they may, in a broad view of the 

 subject, be regarded as identical ; " ^ while for ' Lower Carboniferous,' 

 according to correlations of the fossils from these strata in New 

 Brunswick and Nova Scotia made recently by Professor Kidston 

 and Dr. David White, as recorded by Mr. J. F. Whiteaves in his 

 " Address on the Devonian System in Canada," ^ must we now say 

 ' Lower Devonian ' ? R- W. E. 



la IB "V" I IB "W" S. 



I._Geological Survey of Canada. G. M. Dawson, C.M.G., 

 LL.D., F.E.S., Director. Annual Eeport (New Series), Vol. X. 

 Eeports A, F, I, J, M, S, 1897. 8vo ; with plates and maps. 

 (Ottawa : Dawson, 1899.) 

 rilHE present volume, like its predecessors, contains within its 

 L pages many proofs of the excellent organization as well as 

 the enterprising spirit which controls and animates the operations 

 of all branches of the Survey, and testifies once again to the 

 ' From T/w Ottawa NaturaUst, January, 1900, vol. viii, No. 10, p. 2;)6. 

 2 Geol. Mag., September, 1899, p. 388. 

 ^ Acadian Geology, p. 283. 

 * Section E, American Association, Columbus, Ohio, August, 1899. 



DECADE IV. VOL. VII. NO. IV. 12 



